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Aeromagnetic analysis of the shear zones of Ambaji garnulite, NW India: implications for base-metal mineralization.

Seshu D, Kumar VP, Rao GS, Satyanarayana HVS, & Prakash Kumar.

SCIENTIFIC REPORTS

https://doi.org/10.1038/s41598-026-42287-4 

The analysis was done for high resolution aeromagnetic data to delineate the shear zone of Ambaji granulite in Aravalli Delhi Fold belt, India. The purpose of the analysis is to map the structural features in terms of magnetic characteristics which are associated with base-metal mineralisation. 2.5D modelling of aeromagnetic data reveals the presence of granite gneiss up to a depth of ~3 km capped by a ~0.5 km of alluvium and presence of intrusive dykes within the Erinpura granite, juxtaposed with marble and biotite schist. 3D magnetic inversion at the Tkhatpura region indicates the depth of biotite-amphibolite gneiss/schist is ~500 m associated with sulphide mineralization.

Fig. (a) Geological map of shear zones of the Ambaji granulite region (GSI, 2012a; 2012b; Chauhan et al., 2019; Bakliwal and Ramaswamy,1987; Tiwari et al., 2022); The locations of existing mineral deposits were compiled from https://geodataindia.gov.in. (b) Aeromagnetic anomaly map. 3D magnetic inversion model showing (c) Observed, (d) Predicted magnetic anomaly, and (e) Isosurface susceptibility map.

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